Taking place in an alternate feudal Korea, there exists the country of Jushin. Corruption among the government and its officials plague the land and its people. To correct this, secret government agents known as the amheng osa (“angyo onshi” in Japanese) disguise themselves to eliminate the corrupt threats.
But peace may be out of reach. Jushin is broken with the death of the king, and our protagonist Munsu is one of the last amheng osa. Will he be able to restore Jushin, and bring peace to the land?